I am having a similar problem - have deleted preferences which did not solve - this is since I installed the latest update - it is very slow - and cannot close - says background task running - but when I open background task window - shows nothing - only way to close is to use Windows task manager and end program

My problem is really weird - ID CC 2014 with the latest update can become very slow - at first it was only when I had other applications going [especially Photoshop] - but for the last week it has been every time I try to use it - even with no other app running.

Mouse movements are delayed, any selection takes forever to take effect. When closing - I sometimes get message saying background task is running [but not every time]

new user account didn't help, deleting preferences neither .

I had several ID files open -closed those - crashed ID - rebooted - opened totally different files - same problem.

However - I have just deleted the file Recovery Data in the users/user name/appdata/local/adobe/indesign/version 10.0/en_US/Caches/InDesign REcovery- and that seems to have temporarily fixed the issue as ID is behaving normally now. [I guess that 's the same as creating another user account]

No, that's removing the recovery information that ID uses to open files you were working on when there was a crash or improper shutdown. I've seen that data cause continuing crashes when it also is corrupt, but never a system slowdown, but that certainly doesn't mean it's not possible.